Improvement in mechanical movements



P. B RQADBQOKS. Mohlanc'al Movement.

No. 203,112. Patented April 30,1878.-

Maz-a@ .UNITED STATES PATENT Gtnicn.

PETER BROADBOOKS, OF BATAVIA, NEW YORK.

IMPROVEMENT IN MECHANICAL MVEMENTS.

Specification forming part 0f Letters Patent N0. 203,112, dated April30, 1878 application filed April 26, 1877.

l To all 'whom it may concern? Be it known that I, PETER BRoADBooKs, of.

Batavia, in the county of Genesee, and State of New York, have inventeda new and useful Improvement in Mechanical Movements, of which thefollowing is a speciication:

I have illustrated this invention as applied to a pair of nippers, alsoto a pair of shears. It may also be applied to a varietyr of otherimplements, such as saw-sets, punches, presses, &c., which need not bespecially represented, as I do not limit the invention to any particularapplication.

The characteristics of the invention will sufficiently appear from thefollowing description and claims.

In the annexed drawings, making a part of this specication,Figure 1 isan elevation representing a pair of nippers operated by my improvement.Fig. 2 is a sectional elevation of the same, showing the jaws closed.Fig. 3 is a perspective `view of the sliding wedge, and Fig. 4 anelevation, showing the same movement applied to a pair of shears.

The same letters are employed in all the gures in the indication ofidentical parts.

A is the frame, formed of two plates, attached by rivets. On one edgethe steel-cutter B is attached by means of iianges or dovetailed groovesformed to receive it, and it is.

secured in place by a set-screw. A recess is formed in the side piecesat A', extending through the frame and leaving an open channel, throughwhich the fore end of the wire or rod to be cut may be passed. The otherand movable jaw is formed by the handle or lever G, pivoted to the vsidepieces at C', and, like the latter, formed to receive the correspondingblade D of the nippers. E is the other handle or lever. It is, in likemanner, secured between the plates by a pivot, and has on its head, nearthe pivot, a knuckle, E', which fits in the corresponding recess inaslidingwedge,

F, interposed between the two levers, and held in place by the sideplates. As the levers pass from the position shown in Fig. l to thatshown in Fig. 2, forcing the cutters together, the knuckle moves thewedge toward the end of the levers, thereby bringing the resistancenearer to the pivot which is the fulcrum of lever E, and constantlyincreasing the power applied to the cutters.

The set-screw G controls the movement of the levers, and thus permitsthe edges of the cutters to be kept from acting on one another.

When the handles are freed, the out having been accomplished, the springH attached to lever C, and bearing against the frame A, will force thejaws apart.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. The combination of the frame A, forming or supporting the fixed jawB, the lever O, forming or supporting the jaw D, lever E, having on itshead the knuckle E and the sliding wedge F, substantially as set forth.'

2. In combination with the frame A and jaw B, the lever G and jaw D, thelever E with knuckle E', the sliding wedge for forcing the jaws togetherwith a constantly-increasing force, and the spring H for throwing thejaws apart when released, substantially as set forth.

vers, the jaws, and the sliding wedge, for applying aconstantly-increasing force to the jaws, and the adjusting-screw G, forregulating the relation of the jaws, substantially as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

PETER BROADBOOKS.

3. The combination of the frame, the le- Y

